US8514134B2 - MIMO antenna having parasitic elements - Google Patents

MIMO antenna having parasitic elements Download PDF

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Publication number
US8514134B2
US8514134B2 US13/202,589 US200913202589A US8514134B2 US 8514134 B2 US8514134 B2 US 8514134B2 US 200913202589 A US200913202589 A US 200913202589A US 8514134 B2 US8514134 B2 US 8514134B2
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Prior art keywords
antenna
elements
antenna elements
mimo
bridge
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US13/202,589
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US20110298666A1 (en
Inventor
Chan Ho Kim
Jin Myung Kim
Chang-Gyu Choi
Gyoung Rok Beak
Young Hun Park
Heung Ju Ahn
Yeon Ho Yang
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Mobitech Corp
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Mobitech Corp
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Assigned to MOBITECH CORP. reassignment MOBITECH CORP. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHOI, CHANG-GYU, AHN, HEUNG JU, BEAK, GYOUNG ROK, KIM, CHAN HO, KIM, JIN MYUNG, PARK, YOUNG HUN, YANG, YEON HO
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/378—Combination of fed elements with parasitic elements
    • H01Q5/385—Two or more parasitic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/378—Combination of fed elements with parasitic elements
    • H01Q5/392—Combination of fed elements with parasitic elements the parasitic elements having dual-band or multi-band characteristics

Definitions

  • the present invention relates generally to a Multiple-Input Multiple-Output (MIMO) antenna having parasitic elements, and more particularly, to a MIMO antenna having parasitic elements which includes a plurality of parasitic elements disposed in a one-to-one correspondence with a plurality of antenna elements and a bridge configured to connect the parasitic elements to each other, thereby improving the degree of isolation of each of the antenna elements and diversifying the circuit configuration and design implementation.
  • MIMO Multiple-Input Multiple-Output
  • FIGS. 1 and 2 are diagrams showing the construction of conventional Multiple-Input Multiple-Output (MIMO) antennas.
  • MIMO Multiple-Input Multiple-Output
  • Each of a plurality of antenna elements 10 that constitutes a conventional MIMO antenna includes a radiator 11 and a feed point 12 , and is connected to a ground surface 13 . Since a conventional MIMO antenna, in which a plurality of antenna elements are arranged and which performs multiple input/output operations, is mounted in a small-sized mobile communication terminal, the distance between the antenna elements must be short, in which case electromagnetic waves radiated from the antenna elements cause mutual interference.
  • the conventional MIMO antennas that have been devised to overcome this problem are designed to improve the degree of isolation.
  • the technology used to construct the above-described conventional MIMO antenna reduces the degree of insulation if a sufficient distance is not ensured, unlike that of FIG. 1 , a distance equal to or longer than a predetermined distance must always be secured.
  • the appropriate distance between the antenna elements 10 of a typical MIMO antenna is equal to or longer than 0.5 ⁇ .
  • the slots 14 are formed in the ground surface 13 , as shown in FIG. 2 , it is difficult to mount part of another element in the area of the ground surface 13 where the slots 14 are formed. Also, the location where part of another element can be mounted cannot be freely selected, so there are problems in that circuit configuration and design implementation are limited and are not flexible.
  • an object of the present invention is to provide a MIMO antenna which includes a plurality of parasitic elements attached to one side surface of a board in a one-to-one correspondence with a plurality of antenna elements disposed on the other side surface of the board and a bridge configured to connect the parasitic elements to each other, so that current components affecting the feed points of the plurality of antenna elements are directed to the bridge, thereby improving the degree of isolation of each of the plurality of antenna elements.
  • Another object of the present invention is to provide a MIMO antenna in which even in the case of an antenna in which each of a plurality of antenna elements has multiple bands, the antenna element provides an effective and improved degree of isolation for each frequency band, so that adjacent antenna elements can be operated independently without interference, even though the adjacent antenna elements are operated using the same type of signals, thereby reducing the distance between the antenna elements and diversifying circuit configuration and design implementation.
  • the present invention provides a MIMO antenna having parasitic elements, including a plurality of antenna elements symmetrically disposed on one side surface of a board while maintaining a predetermined distance therebetween; a plurality of parasitic elements disposed on the other side surface of the board in a one-to-one correspondence with the plurality of antenna elements; and a bridge formed of a metal pattern line, and configured to connect the plurality of parasitic elements to each other.
  • a MIMO antenna which includes the plurality of parasitic elements attached to one side surface of the board in a one-to-one correspondence with the plurality of antenna elements disposed on the other side surface of the board and the bridge configured to connect the parasitic elements to each other, so that current components affecting the feed points of the plurality of antenna elements are directed to the bridge, thereby improving the degree of isolation of each of the plurality of antenna elements.
  • the antenna element provides an effective and improved degree of isolation for each frequency band, so that adjacent antenna elements can be operated independently without interference, even though the adjacent antenna elements are operated using the same type of signals, thereby reducing the distance between the antenna elements and diversifying circuit configuration and design implementation.
  • FIGS. 1 and 2 are diagrams showing the construction of conventional MIMO antennas
  • FIG. 3 is a diagram showing the construction of a MIMO antenna according to an embodiment of the present invention.
  • FIGS. 4 and 5 are graphs showing the standing wave ratios of respective antenna elements according to the embodiment of the present invention.
  • FIG. 6 is a rear view of the MIMO antenna according to the embodiment of the present invention.
  • FIG. 7 is a diagram showing the flow of current components through the MIMO antenna when a first antenna element is operated before the embodiment of the present invention has been applied;
  • FIG. 8 is a diagram showing the flow of current components through the MIMO antenna when a second antenna element is operated before the embodiment of the present invention has been applied;
  • FIG. 9 is a diagram showing the flow of current components through the MIMO antenna when the first antenna element is operated after the embodiment of the present invention has been applied;
  • FIG. 10 is a diagram showing the flow of current components through the MIMO antenna when the second antenna element is operated after the embodiment of the present invention has been applied;
  • FIG. 11 is a graph showing the actual measured degrees of isolation before the parasitic elements and the bridge according to the embodiment of the present invention have been applied.
  • FIG. 12 is a graph showing the actual measured degrees of isolation after the parasitic elements and the bridge according to the embodiment of the present invention have been applied.
  • FIG. 3 is a diagram showing the construction of a MIMO antenna according to an embodiment of the present invention.
  • the MIMO antenna having parasitic elements includes first and second antenna elements 110 and 210 disposed on one side surface of a board 100 , a plurality of parasitic elements 120 and 220 disposed on the other side surface of the board 100 , and a bridge 130 configured to connect the plurality of parasitic elements 120 and 220 to each other.
  • first and second antenna elements 110 and 210 are symmetrically disposed at a predetermined interval.
  • Each of the first and second antenna elements 110 and 210 includes a radiator 111 or 211 disposed in a predetermined pattern and a feed point 112 or 212 configured to feed the first or second antenna element 110 or 210 by feeding signals to the radiator 111 or 211 .
  • a metallic plate-shaped ground surface 113 is further provided on the board 100 .
  • first and second antenna elements 110 and 210 are antenna elements which can normally operate in all of the bands required by IEEE 802.11 and 802.16 standards.
  • the first and second antenna elements 110 and 210 acquire frequency bands in which triple resonance occurs and also acquire the radiation performance and bandwidth required for the service of each frequency band, using the branch line technique.
  • the standing wave ratios of the first and second antenna elements 110 and 210 at which triple resonance occurs are shown in FIGS. 4 and 5 in the form of graphs.
  • the first and second antenna elements 110 and 210 resonate in triple resonance frequency bands including resonance frequencies of 2.5 GHz, 3.5 GHz and 5.5 GHz.
  • the present invention is described by a MIMO antenna in which the first and second antenna elements 110 and 210 resonate in multiple frequency bands as in the embodiment described above, the present invention may be applied to an antenna having a plurality of antenna elements, including a MIMO antenna in which first and second antenna elements 110 and 210 resonate in a single frequency band.
  • the parasitic elements 120 and 220 are formed of metal plates on the other side surface of the board 100 which are attached to the rear surfaces of the first and second antenna elements 110 and 210 in a one-to-one correspondence.
  • Each of the parasitic elements 120 and 220 is configured to have an area larger than that of the rear surface of the corresponding first and second antenna elements 110 and 210 on the other side surface of the board 100 .
  • the parasitic elements 120 and 220 are formed so as to be spaced apart from the ground surface 113 .
  • the parasitic elements 120 and 220 in a one-to-one correspondence with the first and second antenna elements 110 and 210 are first used to stabilize resonance occurring in the first and second antenna elements 110 and 220 .
  • the parasitic elements 120 and 220 are mutually coupled to the first and second antenna elements 110 and 210 .
  • the bridge 130 is formed by connecting the parasitic elements 120 and 220 to each other using a metal pattern line with a predetermined width.
  • the bridge 130 directs current components generated through the mutual coupling between the first and second antenna elements 110 and 210 and the parasitic elements 120 and 220 .
  • the bridge 130 Since the bridge 130 is electrically connected to the parasitic elements 120 and 220 , the bridge 130 and the parasitic elements 120 and 220 operate like a single parasitic element.
  • the bridge 130 functions to electrically connect the parasitic elements 120 and 220 to each other, and functions to adjust the length to 0.51 of a frequency band for which the degree of isolation is intended to be improved.
  • a length corresponding to 0.51 of a frequency band for which the degree of isolation is intended to be improved is identical to the length of the path of current components flowing between the feed points 112 and 212 when the first and second antenna elements 110 and 210 are operated.
  • the bridge 130 connecting the parasitic elements 120 and 220 to each other has a length corresponding to path C selected from among paths A, B, C, D and E representing the paths of current components flowing between the feed points 112 and 212 when the second antenna element of FIG. 6 is operated.
  • This length is identical to a length obtained by subtracting the sum of paths A, B, D and E from 0.5 ⁇ of a frequency band for which the degree of isolation is intended to be improved.
  • the length of the bridge affects the distance between the first and second antenna elements 110 and 210 .
  • the appropriate distance between the first and second antenna elements 110 and 210 according to an embodiment of the present invention is reduced to 0.2 ⁇ , 0.29 ⁇ and 0.45 ⁇ for resonance frequencies of 2.5 GHz, 3.5 GHz and 5.5 GHz, respectively.
  • the bridge 130 adjusts the distance between adjacent first and second antenna elements 110 and 210 .
  • FIGS. 7 and 8 are diagrams showing the flow of current components through the MIMO antenna when the antenna elements are operated before the embodiment of the present invention has been applied.
  • the antenna elements 110 and 210 when the antenna elements 110 and 210 are operated, the antenna elements 110 and 210 undergo mutual interference.
  • FIGS. 9 and 10 are diagrams showing the flow of current components through the MIMO antenna when the antenna elements are operated after the embodiment of the present invention has been applied.
  • the bridge 113 cancels current components affecting the feed point of the counterpart antenna element.
  • the antenna elements 110 and 210 do not affect each other, so that the degree of isolation between the antenna elements 110 and 210 is improved.
  • FIG. 11 is a graph showing the actual measured degrees of isolation before the parasitic elements 120 and 220 and the bridge 130 according to the embodiment of the present invention have been applied
  • FIG. 12 is a graph showing the actual measured degrees of isolation after the parasitic elements 120 and 220 and the bridge 130 according to the embodiment of the present invention have been applied.
  • the optimally required degree of isolation of a frequency band occurring in each of the antenna elements 110 and 210 is equal to or greater than ⁇ 15 dB.
  • the actual measured degrees of isolation after the parasitic elements 120 and 220 and the bridge 130 have been applied are relatively uniformly acquired over all of the frequency bands, as shown in FIG. 12 .
  • the present invention has the effect of providing a MIMO antenna which includes the parasitic elements attached to one side surface of the board in a one-to-one correspondence with the antenna elements disposed on the other side surface of the board and the bridge configured to connect the parasitic elements to each other, so that current components affecting the feed points of the antenna elements are directed to the bridge, thereby improving the degree of isolation of each of the antenna elements.
  • the present invention has the effect of providing a MIMO antenna, in which even in the case of an antenna in which each of a plurality of antenna elements has multiple bands, the antenna element provides the effective and improved degree of isolation for each frequency band, so that adjacent antenna elements can be operated independently without interference even though the adjacent antenna elements are operated using the same type of signals, thereby reducing the distance between the antenna elements and diversifying circuit configuration and design implementation.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Details Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
US13/202,589 2009-02-27 2009-10-19 MIMO antenna having parasitic elements Active 2030-06-20 US8514134B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020090016593A KR101013388B1 (ko) 2009-02-27 2009-02-27 기생소자를 갖는 ｍｉｍｏ 안테나
KR10-2009-0016593 2009-02-27
PCT/KR2009/006003 WO2010098529A1 (en) 2009-02-27 2009-10-19 Mimo antenna having parasitic elements

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US20110298666A1 US20110298666A1 (en) 2011-12-08
US8514134B2 true US8514134B2 (en) 2013-08-20

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US (1) US8514134B2 (ko)
KR (1) KR101013388B1 (ko)
CN (1) CN102334236B (ko)
WO (1) WO2010098529A1 (ko)

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CN102334236A (zh) 2012-01-25
CN102334236B (zh) 2014-04-23
US20110298666A1 (en) 2011-12-08
WO2010098529A1 (en) 2010-09-02
KR101013388B1 (ko) 2011-02-14

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